If one is missing or has a corrupted winload.exe - and winload~1.exe, winloadOLD.exe, etc. do not work - what can you do to regenerate it? (Such as after a failed logon screen customization.)
sfc /scannow - should do. Eventually offline scan from recovery CD/USB if you cannot boot.
winload.exe is a system protected file and has full access only by "Trusted Installer". I would not use simple copying, renaming, moving this critical system file !
Copies of winload.exe can be found in:
The default system loader is "\windows\system32\winload.exe".